Silencer for gaseous currents



Sept. 22, 1925.

N. STRAUSSLER SILENCER FOR GASEOUS CURRENTS.

F11od July 192s Patented Sept. 22, 1925.

, v 1,554,534 PATENT OFFICE.

NICHOLAS STRAUSSLER, OF LONDON, ENGLAND, ASSIGNOR TO INTERNATIONALSILENGER COMPANY, LIMITED, OF LONDON, ENGLAND.

SILENCE-ZR. FOR GASEOUS CURRENTS.

Application filed. July 6, 1923. Serial No. 649,847.

ful Improvements in Silencers for Gaseous placed into or removed fromthe silencer Currents, of which the following is a specification.

This invention relates to silencers for gaseous currents such as areproduced in the exhaust of internal combustion engines, where successiveexplosions set up violent sound waves, the periodicity of which it isrequired to eliminate by breaking up the intermittently deliveredvolumes of gas into a level uniform flow.

According to this invention the body of the silencer is made in partsconnected together by means that permit of their being readily separatedor displaced in such manner as to render the internal operative partseasily accessible. The said internal operative parts are in the naturevof a permeable metallic resilient structure which may be in the form ofcartridges or rolls or bundles of loosely packed metal capable of beingbodily body and serving when in place to permit the passage of the gaseswhile equalizing their flow without oifering such obstruction as wouldcreate undue back pressure.

In order that the said invention may be clearly understood and readilycarried into efi'ect the same will now be described more fully withreference to the accompanying drawings, in which Figure 1 represents inlongitudinal section a silencer embodying this invention.

Figure 2 is an elevation of the said silencer viewed from the left-handend of Figure 11.

Figure 3- illust-rates a detail hereinafter mentioned.

In the example illustrated the body of the silencer is composed of twoseparable parts or sections A and B of stamped metal, which may be. ofequal length, but are preferably of difi'erent lengths as shown, inorder that, in the mass production of standard parts, three sizes ofsilencers may be made by combining two long, two short, or one long andone short section. In the case 'ofa very long silencer, a centralcylindrical section may be interposed between two end sections to obtainthe required length, the body of the casing thus being constructed ofthree instead of two sections. Each section of the cylindrical body inthe case of two sections or each end section when threesect-ions areemployed, terminates in a cylindrical neck (0, D) of reduced. diameter;the neck G at the entrance end may be adapted for connection with theexhaust pipe of the engine by extruding radially a hollow wing E,through a hole F in which may pass freely a screw threaded bolt G, andby means of a wing nutH on the end of this bolt the neck O can betightened on to the exhaust pipe. The necks at both ends of the silencerbody may beprovided with such hollow wings, but may be of differentsizes, to enable the silencer to be reversed for attachment to either oftwo exhaust pipes of different diameters, the inoperative wing at theoutlet end not interfering with the action of the silencer.Inden'tations J (Figure 2) may be formed in the neck C adjacent to thelarger or body part of the section A to act as stops preventing theexhaust pipe from entering the said body. On the opposing end of each ofthe sections A and B are rims or beads M, N, which in assembling areembraced by a clip K of channel section, this clip being then tightenedby means of a bolt P and wing nut R. The connections between the endsections and central section in a three-part silencer may comp-risesimilar rims and clips. The internal operative part of the silencerconstituted by the aforesaid permeable metallic resilient structure isin this example in the form of a cartridge S, comprising a bundle ofvery narrow and thin strips of flexible metal enclosed in a foraminous,reticulated bag or cover ,made of sheet material such as netting orloosely knitted or woven fabric made of the same or other suitablematerial. Instead of one cartridge a number of them made in shortlengths may be used, the number employed depending upon the length ofthe silencer. Instead of cartridges'composed of bundles of thin stripsof flexible metal as aforesaid, cartridges composed of a roll of two orother suitable number of sheets of expanded metal may be used, eachsheet of expanded metal being made as is well understood by scoring andslitting a blank sheet of metal which is then metal prior to beingrolled up may he relatively displaced to the extent of half the pitch orspacing of the apertures therein, Alternatively the roll may be composedof metal netting, or the cartridge may be composed of strip metal asaforesaid with an outer casing oi expanded metal. However cartridgesmade up in the form of the narrow and thin strips of flexible metal asaforesaid are considered referable owing to their being resilient in alldirections, whereas the roll form is only radially resilient. The metalused in either case should be out a high melting point and resistant tocorrosion.

In order to increase the surface of the cartridge S exposed totheincoming gases, ribs or iiutings T (Figure 1) may be formed in thebody section A of the silencer, under which ribs the cartridge fits, sothat portions of the sides as well as the end of the can tridge willreceive the said directly. 'lhese ribs or flutings may reachtio the neckC as shown in Figure 1 and periorgi also the function of the,indentations J pre iously mentioned. vWhen. the cartridge .is in theform of a roll of expanded metal it will present a ridged surface, sothat the ribs or tlutings on the body section All. will not benecessary.

Carbon particles travelling with the gases, having a greater inertiathan that of the gases themselves, tend to impinge on' the centre oi thecartridge or other filling, and in order to promote this tendency and tokeep the periphery of the filling as clean as ssible, a recess ordepression, indicated by chain dotted lines-at W in Figure 1, may beformed at the entrance end of the filling, so that the carbon particleswhich do not blow through are retained in and around this recess.

Although the said silencer has been shown in the accompanying drawingsas divided transversely into two parts held together by a clip ofchannel section engaging with rims or beads on the parts or sections ofthe silencer, it is to be understood that the invention is not intendedto be limited to this manner of dividing the silencer into parts and ofconnecting them together. It is to be understood that in the claimswhere the expression permeable metallic resilicnt structure is used,such expression is intended to cover any of the various forms of theinternal operative parts of the silencer heretofore referred to. Y i

What I claim andv desire to secure by Letters Patent of the UnitedStates is 1. A silencer for gaseous currents, comprising a bodyportionbuilt of readily detachable sections, and a filling consisting ofa permeable homogeneous tangled mass of very narrow and thin ribbons offlexible metallic material enclosed in a metal bag made of ioraminousreticulated sheet material adapted to fit bodily into the said bodyportion, said bag being composed of stiffer and stronger material thanthat of which the filling consists. L

2. A. silencer for gaseous currents, cornprising a body portion built ofreadily detachable sections, and a filling consisting of a permeablehomogeneous tangled mass of.

very narrow and thin ribbons of flexible metallic material enclosed in ametal bag made of ioraminous reticulated sheet material adapted to fitbodily into the said body ortion.

3. silencer for gaseous currents, com

prising a, body portion built of readily dein diameter at the outer endsof said body,

a neck at the inlet end to receive the end of a pipe leading the gaseouscurrents to said silencer, internal projections on said neck to limitthe extent to which said pipe can enter said neck, a filling consistingof a tangled mass of very narrow and thin strips of flexible metalenclosed in a reticulated metal bag adapted to fit bodily in the saidbody and ribs at the entrance end of said body for exposing portions ofthe sides as well as the end of said filling to the incoming gaseouscurrents.

5., A silencer for gaseous currents comprising a substantiallycylindrical body made in readily detachable sections of unequal lengthsand reduced in diameter at the outer ends of said body, a neck at theinlet end to receive the end of a ipe leading the gaseous currents tosaid si encer, 1n-

ternal projections on said neck to limit the extent to which said pipecan enter said neck, a filling consisting of a permeable homogeneousmass of metallic material of a resilient character such as a. tangledmass of very narrow and thin strips of flexible metal enclosed in areticulated metal bag adapted to fit bodily in the said body, and ribsat the entrance end of said body for exposing ortions of the sides aswell as the end of S816. filling to the incoming gaseous currents. A

NICHOLAS STRAUSSLER.

